15. Peterson and Peterson XXXXXXXXXXobserved a significant improvement after subjects tested on remembering thematic information were shown some information irrelevant to the common theme as well. In...

Peterson and Peterson (1959) observed a significant improvement after subjects tested on remembering thematic information were shown some information irrelevant to the common theme as well. In other words, "recall rates" improved when the topic was varied. What did they name this effect?

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